Sound-deadening construction for elevated railways.



` Middlesex UNITED SrlATlllilS 1;)ATENT OFFICE.

CHARLES HOWARD rgronovl'on, or omissions, AND nfijLLiAii D; MURPHY, oFNEWTON,

.MAssAcHUsnfrTs SOUND-DEADENING CONSTRUCTION son ELEvAmD namwnisPatented Sept. 22, 1908 Application filed September 23, 1907. Serial No.394,052.

To all whom it 'may concern:

Be it known that we, (IH'AnLns HOWARD CoNovnn, ol' Cambridge, andWILLIAM l). MURPHY, of Newton, both in the county oi and State ollMassachusetts, have invented certain new and useful improvements inSound-Deadening Construction for Elevated Railways, of which thefollowing is a s ecifcation.

vvhe object of this invention is to materially lessen the noise causedby the runningi of railroad cars and trains, particularly on elevatedrailways. This desired end we accom plish by interrupting the continuityot vibration between the rails and they tics or stringers onwhichtheyrest in the ordinary construction. We largely prevent thetransmission of vibration from thek rails to the supporting structure byinterposing between the partsanon-vibrating element adapted to thesevere requirements the rails being *held rmly in position thereon,

The main feature of our improvement and the preferred constructim'i ishereinafter de-A scribed and claimed., and is illustrated in theaccompanying drawings, in which,"

Figure 1 is a transverse vertical section,1 about full size. Fig. 2 is alongitudinal scction, on line 2-2 of Fig. l, taken on a reduced scale.

The characteristic feature of our invention is the continuousnon-vibrating clement or layer 7 introduced between the }.nacticallyrigid parts of therstructure, as between the base of the rail 8 and itsimmediate supports. This layer is preferably of firm rubber packingformed of alternate folds of heavy duck and rubber vulcanized together,asin rubber belting.

Another novel fcaturecf our inventimi is a continuous metallic support.l0 for the non vibratin f laver T, bom extending the mi! length o therail. .ln the drawing such eup-v polt is shown as a broad and sha1 owl0, its marginal walls giving cflicicnt lateral support to the body ofthe packing which ex.- tends thc full width of the trough and may bevulcanized in place.

The packing should be of the best quality and practically unyieldingunder the weight of the car or train, since it rises but above the edgeWalls of the trough trough f dispense with .fisbrplates i i i i l i 1 ialong rail base should. not come in contact with the Walls. They mayeven be omltted where the service is not too severe.

under the strains of use secured n1 any'elhclent manner, as by lagscrews, bolts or spikes 11, and Will have any.

required lateral from spreading. l

The intimate Contact of the non-vibratin packing wi th the rigid partsbetween Whic l supports to prevent them it is held. checks thevibrations of cach and prevents the direct transmission of suchvibrations from one to the other. The'clinging nature of the packingalso tends to resist lengthwise movement' of the rail. The trough formsa continuous metallic support for the packing beneath the rail, bridgingover the spaces between the ties. (See Fic, 2.)

Ve disclaim .the construction shown in v,Tinted States Patent to JosiahFoster,- granted March 20, 1877, No. 188,617, and therein said toLconsist in constructing the rail with a central groove upon the underside of its base, extending its whole length, and. in combining withsuch a supplementary rail of\a length equal to ordinary rails, having acentral iin or rib tovcorrespond with the groove in the main rail.Between these two rail's an elastic acking may beuscd, and wheneversoused t 1e shoe or supplementaryrail may havev side-flanges embracing thesides of the base of the Ina-in rail.

The purpose ol that construction was to It wasl not de# of trains, andeach edge and signed to i'ireven t the noise would not do so, because atbe in actual contact and the vibrations of one directly transmitted to4the other, accompanied by noises due to their rictional move nicht. j Y.Y

ln our im `rovcd construction the rail has the usual 'un tomv betweenits flanges,

is correspondingly flat and continuous,

andy the vnon-vibrating -slightly layer extends from, edge to edge,preventing and. `the metallic Contact. v

an intermediate linesuch rails wouldroken, flat base, the trough boi:-

We claim as our joint invention: 1. In elevated railway construction, acontinuous non-vibrating layer interposed longitudinally between thebase of the rail and its immediate sup orts, and exten dine unbrokenlythe fu width of the rail and from end to end thereof, substantially asset forth.

2. In railway construction, the combination of the rails, aflat-bottomed, longitudi-v nal metallic support beneath each rail,4extending fromend to end and ed eto edge thereof, and a non-vibratingpac ing layer of corresponding dimensions interposed between sald railand supportand in continuous contact with both, substantially as setforth.

3. In railway construction, the combina tionV of the rails, aflat-bottomed, longitudinal, metallic, flanged support beneath eachrail,extending from end to end and from edge to edge thereof, and anon-vibrating packing laver of corresponding dimensions interposedbetween said rail and support and in continuous contact with both, andlying between the flanges of said support, substantially as set forth.

4. In elevated railway construction, the combination ofthe rail, acontinuous longi tudinal support beneath the rail, serving to bridgeover the spaces between successive ties, and a non-vibrating layerinterposed be tween and in contact with said support and 1 rail, therail base and its support and said interposed layer having continuous,unbroken 'contacting surfaces from edge to edge, preventing metalliccontact, substantially as set forth.

5. In elevated railway construction, longitudinal metallic troughssunken in recesses in the ties, and non-vibrating packing layers fillingsaid troughs and extending higherthan the walls thereof, in combinationwith the rail ada ted to rest by its base on said packing, an withsuitable rail fastenings, substantially as and for the purpose setforth.

6. In elevated railway construction, the composite support for the rail,comprising a longltudinal metallic trou h having between its flanges acontinuousv at up er surface,

and a continuous la ver of non-vi rating ma terial as packing, fi lingsaid trough and securely held therein, substantialy as set forth. l

In testimony whereof we have affixed our signatureain presence of twowitnesses.

CHARLES HOWARD COOVER. WILLIAM Il. MURPHY. Witnesses: A. H. SPENCER.,

ARTHUR P. HARDY.

